34 Inch UltraWide™, WQHD Curved (1800R) 144Hz Monitor

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34U640B-B
LG 34U640B-B 34-Inch UltraWide Monitor with curved display showing vibrant red and orange graphics on screen - Front View
LG 34U640B-B 34-Inch UltraWide Monitor displaying vibrant orange and red abstract waves on screen with square base stand - Left View
LG 34U640B-B 34-Inch UltraWide Monitor displaying vibrant orange and red abstract waves on screen with square base stand - Right View
LG 34U640B-B 34-Inch UltraWide Monitor with curved display showing vibrant red and orange graphics on screen - Front View
LG 34U640B-B 34-Inch UltraWide Monitor with curved display showing vibrant red and orange graphics on screen - Front View
LG 34U640B-B 34-Inch UltraWide Monitor with curved display showing vibrant red and orange graphics on screen - Front View
LG 34U640B-B 34-Inch UltraWide Monitor displaying vibrant orange and red abstract waves on screen with square base stand - Left View
LG 34U640B-B 34-Inch UltraWide Monitor displaying vibrant orange and red abstract waves on screen with square base stand - Right View

34 Inch UltraWide™, WQHD Curved (1800R) 144Hz Monitor

34U640B-B
LG 34U640B-B 34-Inch UltraWide Monitor with curved display showing vibrant red and orange graphics on screen - Front View
LG 34U640B-B 34-Inch UltraWide Monitor displaying vibrant orange and red abstract waves on screen with square base stand - Left View
LG 34U640B-B 34-Inch UltraWide Monitor displaying vibrant orange and red abstract waves on screen with square base stand - Right View
LG 34U640B-B 34-Inch UltraWide Monitor back view showing connection ports including HDMI and USB with textured stand base - Back View
LG 34U640B-B 34-Inch UltraWide Monitor with curved display showing vibrant red and orange graphics on screen - Front View
LG 34U640B-B 34-Inch UltraWide Monitor with curved display showing vibrant red and orange graphics on screen - Front View
LG 34U640B-B 34-Inch UltraWide Monitor with curved display showing vibrant red and orange graphics on screen - Front View
LG 34U640B-B 34-Inch UltraWide Monitor displaying vibrant orange and red abstract waves on screen with square base stand - Left View
LG 34U640B-B 34-Inch UltraWide Monitor displaying vibrant orange and red abstract waves on screen with square base stand - Right View
LG 34U640B-B 34-Inch UltraWide Monitor back view showing connection ports including HDMI and USB with textured stand base - Back View

Key features

  • The curved 34" 21:9 UltraWide™ WQHD expands your workspace ideal for multitasking
  • Up to 99% sRGB and HDR10 support deliver consistent color and detail
  • USB Type-C connectivity supports display, data transfer, and up to 65W charging
  • KVM switch support lets one monitor control two PCs with one keyboard and mouse
  • LG Switch app splits your screen, customizes layouts, and streamlines work and play²
  • AMD FreeSync Premium™ delivers tear-free, low-latency gameplay with smooth motion
  • 144Hz refresh¹ and fast response keep motion smooth for work and streaming
  • Space-saving stand design offers tilt and height adjustment with narrow bezel screen
Specifications
  • Picture Quality
  • Special Features
  • Input/Output
  • Stand
  • Power
  • Dimensions/Weights
  • Cabinet/Accessories
  • Warranty
  • See All
    • Picture Quality
    PPI
    110
    Color Depth (Number of Colors)
    1.07B
    Aspect Ratio
    21:9
    Brightness (Typical, Minimum)
    (Typ.) 300 cd/m² (Min.) 240 cd/m²
    Color Gamut (Typ.)
    sRGB 99% (CIE1931)
    Contrast Ratio
    4000:1
    Display Type
    VA
    Pixel Pitch (mm)
    0.23175 x 0.23175
    Refresh Rate
    144Hz
    Resolution
    3440 x 1440
    Response Time (GTG)
    5ms (GtG at Faster)
    Screen Size
    34"
    Viewing Angle
    178º(R/L), 178º(U/D)
    Picture Quality
    PPI
    110
    Color Depth (Number of Colors)
    1.07B
    Aspect Ratio
    21:9
    Brightness (Typical, Minimum)
    (Typ.) 300 cd/m² (Min.) 240 cd/m²
    Color Gamut (Typ.)
    sRGB 99% (CIE1931)
    Contrast Ratio
    4000:1
    Display Type
    VA
    Pixel Pitch (mm)
    0.23175 x 0.23175
    Refresh Rate
    144Hz
    Resolution
    3440 x 1440
    Response Time (GTG)
    5ms (GtG at Faster)
    Screen Size
    34"
    Viewing Angle
    178º(R/L), 178º(U/D)
    Special Features
    Curvature
    1800R
    DTS Headphone:X
    Yes
    AMD FreeSync Premium
    Yes
    VRR
    Yes
    LG Switch
    Yes
    Auto Input Switch
    Yes
    Black Stabilizer
    Yes
    Color Weakness Mode
    Yes
    Crosshair
    Yes
    Curved
    Yes
    Dual Controller
    Yes
    Dynamic Action Sync
    Yes
    Factory Calibration
    Yes
    Flicker Safe
    Yes
    HDR Effect
    Yes
    HDR10
    Yes
    PBP (Picture by Picture)
    Yes
    PIP (Picture in Picture)
    Yes
    Reader Mode
    Yes
    Smart Energy Saving
    Yes
    Super Resolution+
    Yes
    Input/Output
    USB Down-stream
    Yes
    DisplayPort
    Yes
    HDMI
    Yes x 2
    DisplayPort Version 1.4
    Yes
    HDMI Version 2.0
    Yes
    Headphone Out
    Yes
    USB Type-C
    Yes
    USB-C (Data Transmission)
    Yes
    USB-C (Power Delivery)
    65 W
    Stand
    Display Position Adjustments
    Tilt/Height
    Wall Mount Size (mm)
    100 x 100 mm
    Power
    DC Off (Max)
    Less than 0.3W
    Input
    100~240V (50/60Hz)
    Power Save/Sleep Mode (Max)
    Less than 0.5W
    Type
    External Power(Adapter)
    Dimensions/Weights
    Shipping Dimensions (WxHxD)
    38.8" × 18.5" × 7.4"
    Shipping Weight
    22.9 lbs
    With Stand (WxHxD)
    31.9" × 18.3" × 8.7"
    With Stand Weight
    17 lbs
    Without Stand (WxHxD)
    31.9" × 14.1" × 3.6"
    Without Stand Weight
    12.3 lbs
    Cabinet/Accessories
    USB Type-C Cable
    Yes
    Display Port Cable
    Yes
    HDMI Cable
    Yes
    Warranty
    Limited Warranty
    1 Year Parts and Labor
    UPC
    195174147368
    Features

    Widescreen Workflows Made Effortless

    Upgrade your desktop setup with a curved 34" 21:9 UltraWide™ WQHD display that lets you see more at once. Enjoy smooth 144Hz1 visuals, vibrant HDR color, and a sleek, narrow-bezel design—perfect for on-screen multitasking, creativity, and everyday comfort.

    Widescreen Workflows Made Effortless

    Curved 21:9 UltraWide™ WQHD Display

    The 21:9 UltraWide™ WQHD (3440×1440) display gives you room to work across multiple apps at once—reducing window switching and improving focus. The subtle 1800R curve follows your natural line of sight for comfortable long sessions, while the sleek design keeps your workspace open, clean, and distraction-free.

    Curved 21:9 UltraWide™ WQHD Display

    Up to 99% sRGB Color Coverage

    Up to 99% sRGB coverage and HDR10 support deliver balanced color and smooth tonal transitions across documents, media, and HDR content.

    Up to 99% sRGB Color Coverage

    USB Type-C: All-in-One Connectivity

    USB-C connectivity simplifies your setup by handling display, data, and up to 65W laptop charging through a single cable. With DisplayPort and HDMI and two USB ports also on board, it’s easy to connect laptops and peripherals for a cleaner desk and smoother workflows.

    USB Type-C: All-in-One Connectivity

    Dual Controller (KVM Switch)

    Control two PCs with a single monitor, keyboard, and mouse. Easily switch between devices and move files between systems with simple drag-and-drop—streamlining your setup and reducing desk clutter without extra hardware.

    Dual Controller (KVM Switch)

    Customize Your Screen View with the Switch App

    The Switch app2 transforms your screen into a multitasking hub for work, gaming, and streaming. Effortlessly split the screen into up to 6 sections, customize display layouts, or launch video calls with a single hotkey.

    AMD FreeSync Premium™ Technology

    Powered by AMD FreeSync Premium™ certification, this monitor delivers tear-free, ultra-smooth visuals with low latency—so fast motion stays controlled, responsive, and visually precise during gameplay.

    AMD FreeSync Premium™ Technology

    144Hz Keeps Motion Super Smooth

    With a 144Hz refresh rate1 and 5ms response time, this UltraWide™ keeps visuals smooth and clear. Perfect for video calls, streaming, and gaming.

    144Hz Keeps Motion Super Smooth

    Reader Mode Brings Comfort to Reading

    Reader Mode reduces blue light displaying warmer hues and tones ideal for reading documents or browsing for extended periods.

    Reader Mode Brings Comfort to Reading

    Space-Saving Stand with Adjustable Screen

    UltraWide's slim stand with a square base helps keep your workspace clean and organized while saving valuable desk space. The 3-side virtually borderless screen with tilt and height adjustability makes it easy to dial in a comfortable viewing position, and one-click mounting allows for quick, and easy setup.

    Space-Saving Stand with Adjustable Screen
    For owners
    Warranty Information
    Register Your Product
    Other Support Options
    Manuals and Downloads
    Help Library
    Request a Repair

    1Actual refresh rates may vary depending on computer graphics specifications and configurations.

    2Software installation required. Visit Support on LG.com to download.


    Images may be simulated and dramatized for illustrative purposes. Actual features, functionality, and other product specifications may differ and are subject to change without notice. Prices, promotions, and availability may vary by model, store, and online. Prices subject to change without notice. Quantities are limited. Check with your local retailers for their final price and availability.

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